code: def test_enterAsyncContext(self):
      events = []
  
      class Test(unittest.IsolatedAsyncioTestCase):
          async def test_func(slf):
              slf.addAsyncCleanup(events.append, "cleanup1")
              cm = TestCM(events, 42)
              self.assertEqual(await slf.enterAsyncContext(cm), 42)
              slf.addAsyncCleanup(events.append, "cleanup2")
              events.append("test")
  
      test = Test("test_func")
      output = test.run()
      self.assertTrue(output.wasSuccessful(), output)
      self.assertEqual(
          events, ["enter", "test", "cleanup2", "exit", "cleanup1"]
      )
  
imports: import asyncio
  import contextvars
  import unittest
  from test import support
label_desc: Use image node_id 11 for calling the TestAsyncCase obj's underlying member method code with example usage: obj.test_enterAsyncContext() without return types